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- from django.db.backends.base.features import BaseDatabaseFeatures
- from django.db.utils import InterfaceError
- from django.utils.functional import cached_property
-
-
- class DatabaseFeatures(BaseDatabaseFeatures):
- empty_fetchmany_value = ()
- interprets_empty_strings_as_nulls = True
- uses_savepoints = True
- has_select_for_update = True
- has_select_for_update_nowait = True
- has_select_for_update_skip_locked = True
- has_select_for_update_of = True
- select_for_update_of_column = True
- can_return_id_from_insert = True
- can_introspect_autofield = True
- supports_subqueries_in_group_by = False
- supports_transactions = True
- supports_timezones = False
- has_native_duration_field = True
- can_defer_constraint_checks = True
- supports_partially_nullable_unique_constraints = False
- truncates_names = True
- supports_tablespaces = True
- supports_sequence_reset = False
- can_introspect_time_field = False
- atomic_transactions = False
- supports_combined_alters = False
- nulls_order_largest = True
- requires_literal_defaults = True
- closed_cursor_error_class = InterfaceError
- bare_select_suffix = " FROM DUAL"
- uppercases_column_names = True
- # select for update with limit can be achieved on Oracle, but not with the current backend.
- supports_select_for_update_with_limit = False
- supports_temporal_subtraction = True
- # Oracle doesn't ignore quoted identifiers case but the current backend
- # does by uppercasing all identifiers.
- ignores_table_name_case = True
- supports_index_on_text_field = False
- has_case_insensitive_like = False
- create_test_procedure_without_params_sql = """
- CREATE PROCEDURE "TEST_PROCEDURE" AS
- V_I INTEGER;
- BEGIN
- V_I := 1;
- END;
- """
- create_test_procedure_with_int_param_sql = """
- CREATE PROCEDURE "TEST_PROCEDURE" (P_I INTEGER) AS
- V_I INTEGER;
- BEGIN
- V_I := P_I;
- END;
- """
- supports_callproc_kwargs = True
- supports_over_clause = True
- max_query_params = 2**16 - 1
-
- @cached_property
- def has_fetch_offset_support(self):
- return self.connection.oracle_version >= (12, 2)
-
- @cached_property
- def allow_sliced_subqueries_with_in(self):
- return self.has_fetch_offset_support
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